Sewing machine



1939. H. HACKLANDER ET AL 2,180,319

SEWING MACHINE Filed June 22, 1937 5 Sheets-Sheet 1 WITNESSES:

INVENTORS 7721125 fiuirlander 54 y George Saudi,

TTORNEYS.

Nov. 14, 11 E139.

H4 HACKLANDER El AL SEWING MACHINE Filed June 22, 1937 5 Sheets-Sheet 2 MN QNM mm k I I I J INVENTORS: 7721115 iiZwkZandcr 25 George Sauer Nov. 14, 1939. H} HACKLANDER ET AL SEWING MACHINE Filed June 22, 1937 5 Sheets-Sheet 4 INVENTORS: 7121716 ifizcirmnder 13 W w & Um mwbw m m mm/ WW Nov. 14, 1939. HACKLANDIJR ET AL 1 3 SEWING MACHINE By orge Samar ATTORNEYS.

Patented Nov. 14, 1939 SEWING mom Hans Hacklander, Linden, N. J., and George Sauer, Berwyn, Ill., assignors to Union Special -Machine Company, Chicago, 111., a corporation of Illinois Application June 22, 1937, Serial No. 149,595

3 Claims.

This invention relates to sewing machines; and it has reference more especially to feed-off-thearm sewing machines of the kind typified in U. S.

Patent No. 1,741,095, granted to Norman V. Christensen and Harold J. Le Vesconte on December 24, 1929 and in U. S. Patent No. 1,773,028, granted to Norman V. Christensen and Walter M. Hanneman on August 12, 1930.

In machines of the type specifically referred to as heretofore constructed, parts such as thread tensioning and take up devices and means for controlling the tensioning devices and the presser foot were exposed exteriorly of the machine frame where they were in the way and thus apt to be injured themselves or to cause injury to the operatives of the machines.

One aim of our invention is to preclude the contingencies mentioned by providing as hereinafter more fully disclosed for the accommodation of the thread tensioning'and take up devices and the presser foot lifting means within the frame of the machine, together with the mechanism for actuating the needle bar, the complemental stitch-forming means and the feed means, so that all the parts of the machine are completely enclosed except for the needle or needles, the presser foot and the drive wheel.

Our invention is also directed toward the provision of an improved and simplified form of control means for the tensioning devices and the presser foot which adapts itself to being readily enclosed with other mechanisms within the machine frame.

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein Fig. I shows, in plan, a feed-off-the-arrn machine conveniently embodying the present improvements.

Fig. II is a fragmentary view of the machine in plan, drawn to a larger scale, with the top cover members of the hollow machine frame removed and with portions of the frame broken out and sectioned to expose some of the mechanism at the interior.

Fig. III is a side elevation of the machine with portions of the frame broken out and sectioned.

Fig. IV is a longitudinal sectional view through the work supporting arm of the machine.

Fig. V is a view of the work supporting arm partly in plan with the cover plates removed, and partly in horizontal section taken as indicated by the arrows VV in Fig. IV.

Figs. VI and VII are fragmentary detail sec- 55 tional views taken as indicated respectively by the arrows VI--VI and VII-VII in Figs. I and Ii; and

Fig. VIII is a fragmentary sectional view on an I enlarged scale showing the details of one of the tensioning devices of the machine. 5

The sewing machine herein illustrated for convenience of exemplifying our invention has a frame I with a tubular longitudinal portion 2 which is supported at an elevation by a base 3 integrally formed therewith. Joined by a verti- 10 cal tubular portion 4 to one end of the tubular longitudinal portion 2 of the machine frame is a hollow work supporting arm 5 whereof the free end underreaches a hollow laterally projecting head 6 near the corresponding end of said longi- 5 tudinal portion. Confined to vertical reciprocation in the head 6 is a needle bar I which, at its lower end, carries a pair of needles 8. As shown in Figs. II and VI, the needle bar I is reciprocated through a link 9 from a balanced crank element 20 I0 at the front end of a transverse shaft journaled within the head. By means of a pair of miter gears l2 and i3 running in a closed oil compartment I4 interiorly of the machine frame I, the transverse shaft H is driven from the main 25 shaft 5 of the machine. As shown in Fi s. I-III. the main shaft I5 is journaled in suitably spaced bearings l6, l1, l8 and I9 within the elevated tubular portion 2 of the machine frame I, and which is provided at its protruding end with a 30 combined hand and belt wheel 20 so that it may be driven either manually or by power.

Disposed within the hollow of the work supporting arm 5 (see Figs. IV and V) is a feed bar 2| carrying at its front end a feed dog 22 whereof 5 the teeth project upward through an opening 28 in the throat plate 24 of the machine. Adjacent its forward end, the feed bar 2| is pivotally supported by the upper end of vertical links 25 whereof the lower ends are pivotally connected to the 40 horizontal arm 26 of a bell crank lever 21 rule crumed on a pin 28 extending crosswise of the work supporting arm 5. At its rear end, the feed bar 2| is pivotally connected to the pendant arm 29 ofanother bell crank member 3|! fulcrumed 45 on a fixed cross pin 3| at the rear end of the work supporting arm 5, the horizontal arm 32 of the bell crank member being coupled by means of a vertical link rod 33 with an eccentric actuator 34 on the main shaft l5, see Figs. I-III. By the 50 arrangement just described, back and forth or feed movements are continuously imparted to the fged dog 2| incident to rotation of the drive shaft The feed bar 2| derives its lift movement from 2| with capacity for both rocking and endwise movement. Rocking movements are imparted to the looper shaft 48 from a third rotary eccentric actuator 4| on the drive shaft I5 through intermediate connections including a vertical strap rod 42 and a crank arm 43 on said shaft to which said strap rod is connected at its lower end. Endwise movements of the looper shaft 48 are derived from a fourth eccentric actuator 45 on'the' drive shaft I5 through a vertical strap link 46 which at its lower end is connected to'another bell crank lever 41 which is independently rockable on the fulcrum pin 3| hereinbefore mentioned and which is in turn connected by a short link 48 with a collar 49 on the looper shaft 48. The collar 49 is rotatively free on the looper shaft 48 but held against axial movement thereon between the boss of the crank arm and a backing collar 58 fixed on saidshaft. Cooperative with the looper 39 is a spreader 5| which is secured to the front end of a sleeve 52 surrounding the greater portion of the looper shaft 48. The sleeve 52 is oscillated from a fifth eccentric actuator 53 on the drive shaft I5 through an associated strap link 54, whereof the lower end is connected to a bell crank arm 55 aflixed to the rear end of said sleeve. It is to be particularly noted that the five strap rods 33, 36, 42, 46 and 54 all extendthrough the hollow vertical connecting portion of the machine frame between the elevated longitudinal portion 2 and the work supporting arm 5.

Confined to vertical reciprocation in the head 6 independently of the needle bar 1 is a presser bar 56 (see Figs. II, III-and VI), said bar having guidance in bushings 51 and 58 respectively se-' cured in the bottom of the head and in a boss 59 or lug within said head. At its lower end, the presser bar 56 carries a presser foot 68 which is held in yielding contact .with the fabric being sewed during the operation of the machine by a double leaf spring 6| (Figs. II and VI) enclosed within the hollow ,of the machine frame. As shown, the leaf spring 6| is anchored by a stud 62 projectinghpward from a lug 63 within the machine frame and extends forwardly over the main shaft I5 and into the hollow of the head 6. At its outer end the spring 6| is clevised to straddle an inverted stirrup member 64 bearing on the rounded upper end 65 of the presser bar 56. The pressure of the spring 6| is regulatableby a thumb screw 66, the threaded shank of. which passes through a removable section or cover member 61 of the-machine frame. The presser bar 56 is restrained against rotation through engagement of the projection 68 of a collar 69 thereon (see Figs. 11 and III) with a vertically slotted guide plate 18 secured within the head 6. I

' Within the hollow elevated portion of the machine frame I (Figs. II and III), a central chamber 1| is set apart and isolated from two end chambers respectively containing the needle operating and the feed operating mechanisms, by a pair of spaced cross partitions 12 and 13. As shown in Figs. II and VII, the chamber 1| is extended or offset laterally to one side of the shaft I5 so as to provide space forthe accommodation of tensioning devices 14, 14 and 15, 15 respectively for the needle and the looper threads T, T and T, T. Each of these tensioning devices, see Fig. VIII, includes a pair of'disks 16, 11 between which the thread passes, said disks being axially apertured to engage an upright stud 18 whereof the lower threaded end is screwed into a tapped boss 19 integrally formed with a shelf to one side of the shaft I5 within the chamber 1 I. Clamped between a circumferential flange 8| on the stud 18 and the top of the boss 19 is a plate 82 having spaced upstanding fingers 83, 84 at opposite ends thereof for guiding the thread. By means of a.

helical compression spring 85 surrounding the stud 18, the upper disk 16 is yieldingly urged toward the lower disk 11 so that restraint is normally imposed upon the thread to tension it as it passes between said disks. The pressure of the spring 85 is regulatable to vary the tension on the thread by means of a thumb nut 86 engaging screw threads on the. upper part of the stud 18. Secured to that portion of the drive shaft I5 extending through the chamber 1| is a pair of rotary take ups 81, 88, respectively for the needle and looper threads T, T and T, T. En route from suitable individual sources of supply (not shown) the threads T, T and T, T respectively enter the compartment 1.I through tubular ingress guides 89, 89 and 98, 98 in one side wall of the elevated portion 2 of the machine frame and leave it by way of tubular guides 9 I-, 92 in the other side wall of said elevated frame portionall as shown in Figs. II, andv VII. Within the chamber 1|, the threads T, T respectively pass first to the tension devices 14, 15 and thence through fixed guides shown at 93, 94 to the rotary take ups 81, 88 on the main shaft I5. After emerging from the chamber 1| through the guides 9|, 92, the threads T, T, T', T are directed to the needles 8 and the loopers 39 by other suitable guides which are not illustrated in the drawings. The chamber 1| is closed at the top by a cover member 95 which is attached along one edge thereof 7 by a hinge connection 96, see Figs. 11 and III, and which is provided at one or more points, as instanced in Fig. VII, with downwardly extending spring fingers 91 adapted to frictionally engage the inside edges of the access opening of said chamber.

For the purpose of controlling the presser foot 68, we have provided means including a lifting finger 98 which, as shown in Figs. II and VI is fulcrumed on a horizontal pin 99 extending crosswise of the head 6 and which engages the underside of another projection I88 of the collar 69 hereinbefore mentioned, on the presserv bar 56. Secured to a rock shaft I82 journaled within the hollow of the base 3 of the machine frame I is a bell crank lever I83 whereof the upwardly extending arm I84 is coupled, by means of a horizontal link I 85 overreaching the drive shaft I5 to an upwardly extending arm I86 of the lifting finger 98, the downward angular arm I81 of the bell crank I83 being in turn connected by a chain I88 to a foot treadle or the like (not illustrated). Downward pull on thechain I88 will obviously cause counterclockwise movement of the bell crank I83, which movement will be imparted through the link I85 to the finger 98 with resultant lifting of the presser bar 56 to elevate the presser foot 68 above the throat plate 24.

In order that the tension on the needle threads T, T may be relieved concurrently with lifting of 75 the presser foot 60, further provisions have been made according to our invention as follows: From Figs. II, VII and VIII, it will be noted that the rock shaft I02 is disposed to one side of the shaft I5 in parallelism therewith, and that it extends through the portion I2 (which is continued as the side wall of the chamber 12) beneath the bottom of the intermediate chamber II where it is formed with an eccentric end portion I I0. As shown the eccentric end III] of the rock shaft I02 is in line with the needle thread tensioning devices 14 and engaged by pins I I I axially within the studs I8 of the said devices. At their upper ends, each pin III engages a diametral web portion II2 of the upper disk 16 of the corresponding tensioning device 14, said web extending crosswise of a longi-' tudinal slot H3 in the upper part of the studs 18. Thus incident to rocking movement of the shaft I02 as the presser foot 60 is lifted, the upper disks 76 of the two tensioning devices 14 are raised through the action of the eccentric portion I III of said shaft upon the pins I I I with resultant release of the drag on the needle threads T, T.

While the machine herein illustrated is arranged for forming two independent rows of stitching, it is evident that the same can be readily adapted, by increasing or decreasing the number of needles and loopers, for the production of single rows of stitches or to form a seam with more than two rows. Or again, it may be arranged to produce a seam with connected multiple rows of stitches such as featured in U. S. Patents Nos. 883,614 and 1,934,328 granted respectively to Stockton Borton on March 31, 1908 and to Charles F. Rubel on November '7, 1933.

From the foregoing, it will be apparent that we have provided a sewing machine having all its parts, except for the needle, presser foot and the drive wheel, enclosed within its frame where they are protected against injury through impact with other objects and where they in turn cannot cause injury to the operatives of the machine.

Having thus described our invention, we claim:

1. In a sewing machine a frame with a work support and with a hollow horizontal portion at an elevation above said support; a shaft extending longitudinally through the elevated portion of the frame; spaced cross partitions affording intermediate bearings for the shaft and subdividing the hollow of the elevated portion into three aligned isolated chambers whereof the central one is extended or offset laterally to one side of the shaft; needle operating mechanism in one of the end chambers; feed operating mechanism in the other end chamber; thread take up means on the portion of the shaft within the central chamber; and an associated yarn tension means disposed in the lateral offset of said central chamber.

2. In a sewing machine a frame with a work support and with a hollow horizontal portion at an elevation above said support; a shaft extending longitudinally through the elevated portion of the frame; spaced cross partitions affording intermediate bearings for the shaft and subdividing the hollow of the elevated portion into three aligned isolated chambers whereof the central one is extended or offset laterally to one side of the shaft; needle operating mechanism in one of the en.l chambers; feed operating mechanism in the other end chamber; thread take up means on the portion of the shaft within the central chamber; an associated yarn tensioning'means disposed in the lateral offset of the central chamber, said means comprising a pair of spring pressed ,disks between which the thread passes; a rock shaft extending beneath the lateral offset of the central chamber; and a tension releasing member extending down from the disks through the bottom of the lateral offset and actuated from said rock shaft.

3. In a sewing machine a frame with a work support and with a hollow horizontal portion at an elevation above said support; a shaft extending longitudinally through the elevated portion of the frame; spaced cross partitions affording intermediate bearings for the shaft and subdividing the hollow of the elevated portion into three aligned isolated chambers whereof the central one is extended or offset laterally to one side of the shaft; needle operating mechanism in one of the end chambers; feed operating mechanism in the other end chamber; thread take up means on the portion of the shaft within the central chamber; an associated yarn tensioning means disposed in the lateral offset of the central chamber; and a top cover for the central chamber capable of retraction for access to the take up and tensioning means.

HANS HACKLANDER. GEORGE SAUER. 

